Schematic in PDF form, 1.32 MB, for the UL20A according to its short name. No revision or board number beyond that code is stated, so read the cover page to confirm the exact PCB version. Circuit diagrams like this are the main reference when tracing a dead rail and checking power sequencing. They also show how the embedded controller, chipset and memory connect, which helps when diagnosing no-power, no-charge or no-display faults. Compare the details with the markings on your motherboard before relying on it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.